nSVM: Remove NPT reserved bits tests (new one on the way)

Remove two of nSVM's NPT reserved bits test, a soon-to-be-added test will
provide a superset of their functionality, e.g. the current tests are
limited in the sense that they test a single entry and a single bit,
e.g. don't test conditionally-reserved bits.

The npt_rsvd test in particular is quite nasty as it subtly relies on
EFER.NX=1; dropping the test will allow cleaning up the EFER.NX weirdness
(it's forced for _all_ tests, presumably to get the desired PFEC.FETCH=1
for this one test).

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622210047.3691840-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>